Chinese Journal of Catalysis ›› 2023, Vol. 47: 171-180.DOI: 10.1016/S1872-2067(23)64397-9
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Zhipeng Xiea,1, Xiubei Yangb,1, Pei Zhangb, Xiating Kea, Xin Yuanb, Lipeng Zhaib,*(), Wenbin Wanga, Na Qinb, Cheng-Xing Cuic,*(
), Lingbo Qud, Xiong Chena,*(
)
Received:
2022-10-19
Accepted:
2023-01-16
Online:
2023-04-18
Published:
2023-03-20
Contact:
*E-mail: zhailp@zut.edu.cn(L. Zhai),chengxingcui@hist.edu.cn(C.-X. Cui),chenxiong987@fzu.edu.cn (X. Chen).
About author:
1Contributed equally to this work.
Supported by:
Zhipeng Xie, Xiubei Yang, Pei Zhang, Xiating Ke, Xin Yuan, Lipeng Zhai, Wenbin Wang, Na Qin, Cheng-Xing Cui, Lingbo Qu, Xiong Chen. Vinylene-linked covalent organic frameworks with manipulated electronic structures for efficient solar-driven photocatalytic hydrogen production[J]. Chinese Journal of Catalysis, 2023, 47: 171-180.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(23)64397-9
Fig. 1. Synthesis and characterization of COFs. (a) Schematic synthetic routes of TM-TA-COF, TM-MA-COF, and TM-DMA-COF. Experimental (red), Pawley-refined (purple circles), simulated powder X-ray diffraction patterns of AA (orange) and AB (green) stacking, and difference curves (black) of TM-TA-COF (b), TM-MA-COF (c), and TM-DMA-COF (d). Top and side views of TM-TA-COF (e), TM-MA-COF (f), and TM-DMA-COF (g). N2 sorption isotherms at 77 K for TM-TA-COF (h), TM-MA-COF (i), and TM-DMA-COF (j). Inset: pore-size distribution.
Fig. 2. (a) UV-vis DRS profiles of TM-TA-COF (black), TM-MA-COF (green), and TM-DMA-COF (cyan). Integrated PL emission intensity as a function of temperature from 100 to 300 K (Inset: temperature-dependent PL spectra) for TM-TA-COF (b), TM-MA-COF (c), and TM-DMA-COF (d).
Fig. 3. (a) Photocatalytic HERs of the obtained COF samples. (b) Photostability test of TM-DMA-COF for photocatalytic H2 evolution. Electrostatic potential surfaces (c) and HOMO-LUMO distributions (d) of TM-TA-COF, TM-MA-COF, and TM-DMA-COF.
Fig. 4. Calculated molecular structures and average Bader charges (a negative value indicates electron gain. Higher absolute values indicate stronger electron-withdrawing abilities) of donor moieties in TM-TA-COF (a), TM-MA-COF (b), and TM-DMA-COF (c). The total densities of states (TDOSs) and partial densities of states (PDOSs, red and blue for fragments 1 and 2, respectively) in each defined fragment of TM-TA-COF (d), TM-MA-COF (e), and TM-DMA-COF (f). The free-energy variations for the H2 evolution at each active site of TM-TA-COF (g), TM-MA-COF (h), and TM-DMA-COF (i).
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